HELP; misfire on all four cylinder

I keep getting a check engine light stating that I'm misfiring on all four cylinders. My car drives fine though with no sign of it. I have an MSD 6al and SS blaster coil. I called MSD and asked if maybe I needed a tach adapter but the guy said it wasn't necessary. What are possible problems. I thought it could be ECU related or that maybe the plug wires I'm using could be interfering with it. Has this happened to anyone else?

i got msd on my ek and i got a misfire on cylinder 1 and 3...i thought it was the plugs or a bad connection then i checked resistance at the wires and it was very high....so i just repalced my wires then it was all g from there... check out the resistnace...its a shot...kdens

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